Mary bought a length of ribbon. She used 2/5 of it to wrap a package and 1/5 of it for a bow. If she used 60 in. of the ribbon, what was the length of the ribbon she bought?
(2/5 + 1/5)x = 60
(3/5)x = 60
x = 60 / (3/5)
x = 60 * (5/3)
x = 300/3 = 100 inches